Just had a season on jupiter in what looked like good seeing but images weren't what i would expect of the sw180.
defocused a star and saw why collimation out a little bit. I've added a focuser to the rear and was using a tak prism maybe this is why??
Anyway I used a simple system to id the adjustment needed ( an object I could see over the front lined up with collimation screws.)
Then went to a star near the southern pole defocused and made a little adjustment which made it worse. reversed this a couple of times checking and centering star each time and pretty much found perfection. i was using 233 x a 12.5mm ortho.
Then went to jupiter and oh boy what an improvement ovals festoons grs coming round amazing detail. its virtually overhead here at 0500 in the morning.
I left scope out to acclimatize overnight.
Collimation is so important and relatively easy with a sw mak.